André Villas-Boas said on Monday that Tottenham Hotspur will not be swayed by Luka Modric's "revolt" as the midfielder attempts to force through a move to Real Madrid by refusing to train with the first-team squad.

Tottenham's manager said the club regarded Modric as unprofessional for failing to turn up to training and missing the squad's flight to Los Angeles, where they face LA Galaxy in a friendly on Tuesday. The Croatia international returned to Spurs Lodge on Monday to prepare for the new season but will be fined two weeks' wages, amounting to £80,000.

Spurs are also without Scott Parker, who is set to undergo surgery that would lead him to miss the start of the domestic season and England's friendly against Italy in Switzerland on 15 August. He could also be ruled out of the first two World Cup qualifiers, away to Moldova and at home to Ukraine, on 7 and 11 September. The midfielder suffered from a persistent achilles problem during the latter stages of last season and Euro 2012.

"There might be a small tear on his achilles – we are at the moment evaluating the situation regarding a possible operation that can take four to six weeks normally to heal," Villas-Boas said.

The relationship between Tottenham and Modric looks to be fractured beyond repair given both parties' entrenched positions. Villas-Boas said the club will sell their playmaker only if they receive an offer that meets their valuation – around £40m. After missing out on a move to Chelsea last summer because Tottenham refused to let him leave, the player wants a higher wage and Champions League football.

However, he is under contract until 2016 so Daniel Levy, the Tottenham chairman, feels under no compulsion to sell at a knock-down price.

"There are clubs interested in him but we have to hold on to our values and our rights and at the moment the situation for Luka is he is under club discipline," Villas-Boas said. "Unfortunately for him he's going to have to be fined for not being present.

"He's a player who has offered so much for Tottenham so we have a sense of respect for what he's done over the years for us but the chairman feels that the fact that he's not present is not common professional behaviour. The situation can be solved in two ways, the two ways being that the clubs interested meet the demands of Tottenham regarding the player's value or the player continues and returns to the club," he added.

Modric was reported to have flown to Croatia rather than California last week, though Villas-Boas said on Monday that he understood the 26-year-old is back in London. Chelsea, after signing Eden Hazard and Marko Marin this summer and with Oscar poised to arrive, are well stocked in midfield, making Real the most realistic destination for Modric, although Paris Saint-Germain also have the financial muscle to make a strong bid. Levy does not want to sell to a Premier League rival.

"Hopefully this is a situation that won't drag on for long," Villas-Boas said. "The situation is not dependent on Tottenham, it's dependent on the clubs who are interested in the player. This type of player revolt is not new but I think that clubs have to protect themselves. There's plenty of time in the market.

"It's the first time unfortunately for Luka that he takes these actions. I think the chairman and myself have been very open by saying we are willing to listen to offers for the player, which is uncommon, I think. He's had many interests in the past like last year but he has always behaved professionally. We never doubted his human qualities so we don't know what kind of advice he's receiving."

Villas-Boas is keen on signing Emmanuel Adebayor from Manchester City on a permanent basis after his successful loan spell last season. However, the striker's £170,000-a-week wages are the stumbling block. "There is obvious interest from us but it doesn't mean that we go down that route," Villas-Boas said.